The DAC1408D650 is a high-speed 14-bit dual channel Digital-to-Analog Converter (DAC) with selectable 2x, 4x or 8x interpolating filters optimized for multi-carrier WCDMA transmitters. Because of its digital on-chip modulation, the DAC1408D650 allows the complex pattern provided through lane 0, lane 1, lane 2 and lane 3, to be converted from baseband to IF. The mixing frequency is adjusted via a Serial Peripheral Interface (SPI) with a 32-bit Numerically Controlled Oscillator (NCO) and the phase is controlled by a 16-bit register. The DAC1408D650 also includes a 2x, 4x or 8x clock multiplier which provides the appropriate internal clocks and an internal regulation to adjust the output full-scale current.

Features

1.8 V and 3.3 V power supplies

32-bit programmable NCO frequency

650 Msps maximum update rate

ACPR: 71 dBc

two carriers WCDMA

fs = 640 Msps

fo = 133 MHz

Differential CML receiver with embedded termination

Differential scalable output current from 1.6 mA to 22 mA

Dual 14-bit resolution

Embedded complex modulator

External analog offset control (10-bit auxiliary DACs)

Four JESD204A serial input lanes

Fully compatible SPI port

IMD3: 80 dBc

fs = 640 Msps

fo = 140 MHz

Industrial temperature range from -40°C to +85°C

Input data rate up to 312.5 Msps

Integrated PLL can be bypassed

Internal digital offset control

Inverse (sin x) / x function

LMF = 421 or LMF = 211 support

LVDS compatible clock inputs

On-chip 1.29 V reference

Power-down mode and Sleep modes

Selectable 2x, 4x or 8x interpolation filters

Synchronization of multiple DAC outputs

2's complement or binary offset data format

Typical 1.26 W power dissipation at 4x interpolation, PLL off and 640 Msps

Tools & Support

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